CN103464877B - For the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually - Google Patents

For the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually Download PDF

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Publication number
CN103464877B
CN103464877B CN201310313448.4A CN201310313448A CN103464877B CN 103464877 B CN103464877 B CN 103464877B CN 201310313448 A CN201310313448 A CN 201310313448A CN 103464877 B CN103464877 B CN 103464877B
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welding
welding rod
soldering method
p690ql1
arc soldering
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CN103464877A (en
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潘伍覃
黄金祥
宋朝文
肖涛涛
韩东波
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Wuhan Yiye Steel Structure Co Ltd
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Wuhan Yiye Steel Structure Co Ltd
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Abstract

The invention provides a kind of welding rod arc soldering method welded mutually for P690QL1 and Q370R steel, it comprises the following steps: 1) SMAW groove adopts asymmetry X-groove; The welding rod model adopted is E6015-E; 2) by the preheating of P690QL1 and Q370R steel plate; 3) welding condition is welding current 150 ~ 170A, arc voltage 23 ~ 28V, speed of welding 8.5cm/min, thermal weld stress amount 35KJ/cm, and the welding rod system of curing is 350 DEG C × 2h.Adopt described method to weld P690QL and Q370R steel plate, welding point has excellent joint combination property, and each region of welding point has higher impact flexibility deposit and the rich degree of safety.

Description

For the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually
Technical field
The present invention relates to iron and steel welding field, especially relate to a kind of high strength pressure vessel quenched and tempered steel P690QL1 and a kind of welding rod arc soldering method welded mutually compared with low-intensity pressure vessel normalized steel Q370R steel.
Background technology
Water-borne transport is the major way of current conveying liquified oil gas (LPG), and it stores the main large-scale LPG ship tank relied on ship.
LPG ship tank is primarily of cylindrical shell and end socket composition, and at present, rapidly, volume is from 3700m for the development of domestic LPG ship tank 3to 4500m 3arrive 5500m again 3, the LPG ship tank of larger volume is also among research and development, and the maximization of LPG ship tank be unable to do without the application of high-strength steel.P690QL steel is the fine grain quenched and tempered steel that yield strength is not less than 690MPa, and perform EN10028.6-2003 standard criterion, be mainly used in the shell portion of LPG ship tank, end socket can adopt pressure vessel Q370R steel.Its intensity rank is low 3 grades (about 335MPa) of P690QL comparatively.
The connection of cylindrical shell and end socket belongs to different steel weld, because between P690QL1 and Q370R two kinds of steel, intensity difference is larger, and easily there is cold crack in P690QL steel postwelding, if adopt the words of low coupling (selecting wlding by Q370R hardness of steel) routinely, the intensity of weld metal differs close to one times with the intensity of P690QL steel, and postwelding easily forms comparatively imperial palace stress guide refrigeration crackle and occurs at joint welding place.
Therefore, suitable wlding and welding procedure must be selected, take into full account the Performance Match of two kinds of steel, effectively could ensure the quality of high strength Dissimilar Steel Welded Joint.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of welding rod arc soldering method welded mutually for P690QL1 and Q370R steel that can ensure high strength Dissimilar Steel Welded Joint quality.
The present invention for solving the problems of the technologies described above taked technical scheme is:
For the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually, it is characterized in that, the method comprises the following steps:
1) SMAW groove adopts asymmetry X-groove, and front bevel angle is 70 °, and backing groove is 60 °, and groove gap is 2mm; The welding rod model adopted is E6015-E, its composition is as follows: C≤0.10%, Si≤0.75%, 0.75%≤Mn≤1.50%, P≤0.020%, S≤0.010%, 0.60%≤Ni≤1.20%, 0.15%≤Mo≤0.35%, other alloying element total amount≤1.50%, surplus is Fe and inevitable impurity, and diffusible hydrogen content (mercury process) is less than 2.5ml/100g; Ni plays solution strengthening, plays good effect to raising welding seam toughness; The effect of Mn improves toughness, intensity, but the too high levels of Mn can reduce weldability.
2) P690QL1 and Q370R steel plate is preheated to 130 ~ 150 DEG C;
3) welding condition is welding current 150 ~ 170A, arc voltage 23 ~ 28V, speed of welding 8.5cm/min, thermal weld stress amount 35KJ/cm, and the welding rod system of curing is 350 DEG C × 2h;
4) carry out the hydrogen heat treatment that disappears after welding, insulation 1-2 hour, holding temperature is 250 DEG C ~ 300 DEG C;
5) weld seam Non-Destructive Testing qualified after, carry out the heat treatment of postwelding stress-removal, thermostat temperature is: 565 ± 20 DEG C, is incubated 2 hours.
In such scheme, the mechanical property of the deposited metal of the welding rod adopted: yield strength Rel >=490MPa; Tensile strength Rm610 ~ 730MPa; Percentage elongation A >=20%;-50 DEG C of ballistic works: Akv >=54J.
In such scheme, chemical composition and the mass percent of described P690QL1 steel plate meet the following conditions: C≤0.20%, Si≤0.80%, Mn≤1.70%, P≤0.020%, S≤0.010%, N≤0.015%, B≤0.005%, Cr≤1.50%, Mo≤0.70%, Cu≤0.30%, Nb≤0.06%, Ni≤2.50%, Ti≤0.05%, V≤0.12%, Zr or Al, wherein select during Zr and make Zr≤0.15%, select during Al and make Al >=0.018%, surplus is Fe and inevitable impurity.
In such scheme, the mechanical property of described P690QL1 steel plate meets: yield strength R el>=690MPa, tensile strength R m: 770 ~ 940MPa, percentage elongation A>=14%, clod wash b=3a, d=3a, 180 ° are qualified ,-20 DEG C of side knock merit Akv>=40J.
In such scheme, chemical composition and the mass percent of described Q370R steel plate meet the following conditions: C≤0.18%, Mn:1.20 ~ 1.60%, Si :≤0.55%, S≤0.010%, P≤0.020%, Nb:0.015 ~ 0.050%.
In such scheme, described Q370R steel mechanical property meets: yield strength R el>=340MPa, tensile strength R m: 520 ~ 630MPa, percentage elongation A>=20%, clod wash b=2a, d=3a, 180 ° are qualified ,-20 DEG C of side knock merit Akv>=47J.
In such scheme, described welding rod arc soldering method adopts multi-layer multi-pass welding, and interlayer temperature controls be no more than 250 DEG C.
Compared with prior art, the technique effect that the present invention obtains is:
1) the inventive method is by test of many times, and the intensity of the wlding selected, between two kinds of steel, makes Q370R steel, weld metal become gradient to arrange with the intensity of P690QL steel three, the problem that internal stress can be avoided too to concentrate, and reduces the probability that cold crack occurs.
2) adopt described method to weld P690QL and Q370R steel plate, welding point has excellent joint combination property, and each region of welding point has higher impact flexibility deposit and the rich degree of safety.
3) the method is applied widely, can be used for the all-position welding that high-strength steel welds mutually with low-alloy steel, the welding of corner joint.
4) welding rod arc soldering method of the present invention has fully taken into account the performance of two kinds of steel, effectively ensure the quality of high strength Dissimilar Steel Welded Joint, especially carry out through thermostat temperature be: 565 ± 20 DEG C, be incubated the postwelding stress-removal heat treatment (SR) of 2 hours, the high tenacity of welding point when still can ensure-20 DEG C.
Accompanying drawing explanation
The structural representation of the groove that Fig. 1 provides for the embodiment of the present invention 1.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and certain following embodiment should not be construed as limitation of the present invention.
Embodiment 1
The present embodiment provides a kind of welding rod arc soldering method welded mutually for P690QL1 and Q370R steel, and the method comprises the following steps:
1) SMAW groove adopts asymmetry X-groove, and front bevel angle is 70 °, and backing groove is 60 °, and groove gap is 2mm; The welding rod model adopted is E6015-E, its composition is as follows: C:0.067%, Si:0.28%, Mn:1.45%, P:0.011%, S:0.008%, Ni:0.982%, Mo:0.23%, other alloying element total amount≤1.50%, surplus is Fe and inevitable impurity, diffusible hydrogen content (mercury process): 2.35ml/100g;
2) P690QL1 and Q370R steel plate is preheated to 130 ~ 150 DEG C;
3) welding condition is welding current 150 ~ 170A, arc voltage 23 ~ 28V, speed of welding 8.5cm/min, thermal weld stress amount 35KJ/cm, and the welding rod system of curing is 350 DEG C × 2h;
4) carry out the hydrogen heat treatment that disappears after welding, insulation 1-2 hour, holding temperature is 250 DEG C ~ 300 DEG C;
5) weld seam Non-Destructive Testing qualified after, carry out the heat treatment of postwelding stress-removal, thermostat temperature is: 565 ± 20 DEG C, is incubated 2 hours.
Below the technological parameter in this welding rod arc soldering method is specifically described:
1) preheat temperature:
P690QL1 and the Q370R of 32mm uniform thickness is adopted to weld in the present embodiment, the chemical composition C:0.15% of the P690QL1 of its test, Si:0.24%, Mn:1.06%, P:0.009%, S:0.003%, N:0.0071%, B:0.0019%, Cr:0.32%, Mo:0.26%, Cu:0.070%, Nb:0.023%, Ni:0.41%, Ti:0.016%, V:0.039, Al:0.047%, surplus is Fe and inevitable impurity, carbon equivalent ce=0.48.The composition C:0.16% of Q370R steel plate, Si:0.36%, Mn:1.54%, P:0.013%, S:0.002%, Nb:0.032%.Wlding diffusible hydrogen content (mercury process) is for calculate by 2.5ml/100g, and the minimum preheat temperature preventing cold crack from occurring is 130 ~ 150 DEG C.Actually be preheating to 140 DEG C before weldering, in welding process, the strict interlayer temperature that controls is no more than 250 DEG C.
2) welding material:
The present invention selects welding material to be the welding rod of E6015-E, and its composition meets C:0.067%, Si:0.28%, Mn:1.45%, P:0.011%, S:0.008%, Ni:0.982%, Mo:0.23%, other alloying element total amount≤1.50%.The deposited metal mechanical property of welding rod will meet: yield strength Rel >=490MPa; Tensile strength Rm610 ~ 730MPa; Percentage elongation A >=20%;-50 DEG C of ballistic works: Akv >=54J.
3) SMAW groove adopts asymmetric X-type (as shown in Figure 1), and front bevel angle is 70 °, and backing groove is 60 °, and groove gap is 2mm, the thickness 32mm of described material.
4) welding condition: select welding condition, the control range of the thermal weld stress amount of outer-20 DEG C of ballistic work AKv >=31J in 1mm, 3mm, 5mm place of Weld pipe mill, melt run and line is :≤35KJ/cm; During welding, preheat temperature is minimum is 130 DEG C, and interlayer temperature controls at≤250 DEG C.Welding current 150 ~ 170A, arc voltage 23 ~ 28V, speed of welding 8.5cm/min, thermal weld stress amount 35KJ/cm, the welding rod system of curing are 350 DEG C × 2h.Banjo fixing butt jointing adopts multilayer multiple tracks continuous sequence, till weld seam fills up.
Result of the test: through carrying out mechanical properties test, its result of the test: tensile strength Rm:580MPa, clod wash d=4a to P690QL and the Q370R steel plate banjo fixing butt jointing adopting said method to weld, 180 ° qualified.-30 DEG C of ballistic works: weld seam Akv:70J, P690QL1 side melt run, melt run outer 1mm, 3mm, 5m, Akv:86,93,114,178, Q370R side melt runs, melt run outer 1mm, 3mm, 5m, Akv:112,162,101,173.
Comparative example 1
Comparative example 1 is roughly the same with embodiment 1, and difference is that the composition of the welding rod selected is different.The composition of the welding rod that comparative example 1 is selected is as shown in table 1.
Table 1
The test result of the dissimilar steel joint tensile strength that comparative example 1 obtains is as shown in table 2.
Comparative example 2
Comparative example 2 is roughly the same with embodiment 1, and difference is that the welding condition selected is different, is specially: welding current 180 ~ 200A, arc voltage 26 ~ 30V, speed of welding 8cm/min, thermal weld stress amount 45KJ/cm, the welding rod system of curing is 350 DEG C × 2h.。
The test result of the dissimilar steel joint tensile strength that comparative example 2 obtains is as shown in table 2.
Table 2
As can be seen from Table 2, in comparative example 1 and comparative example 2, weld strength is suitable with the present invention, but weld seam and P690QL1 side melt run low-temperature impact toughness on the low side, design instructions for use cannot be met.
It should be noted that, those of ordinary skill in the art should be appreciated that and can modify to technical scheme of the present invention or equivalent replacement, and does not depart from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of right of the present invention.

Claims (7)

1., for the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually, it is characterized in that, the method comprises the following steps:
1) SMAW groove adopts asymmetry X-groove, and front bevel angle is 70 °, and backing groove is 60 °, and groove gap is 2mm; The welding rod model adopted is E6015-E, its composition is as follows: C≤0.10%, Si≤0.75%, 0.75%≤Mn≤1.50%, P≤0.020%, S≤0.010%, 0.60%≤Ni≤1.20%, 0.15%≤Mo≤0.35%, other alloying element total amount≤1.50%, surplus is Fe and inevitable impurity, and diffusible hydrogen content is less than 2.5ml/100g;
2) P690QL1 and Q370R steel plate is preheated to 130 ~ 150 DEG C;
3) welding condition is welding current 150 ~ 170A, arc voltage 23 ~ 28V, speed of welding 8.5cm/min, thermal weld stress amount 35KJ/cm, and the welding rod system of curing is 350 DEG C × 2h;
4) carry out the hydrogen heat treatment that disappears after welding, insulation 1-2 hour, holding temperature is 250 DEG C ~ 300 DEG C;
5) weld seam Non-Destructive Testing qualified after, carry out the heat treatment of postwelding stress-removal, thermostat temperature is: 565 ± 20 DEG C, is incubated 2 hours.
2. welding rod arc soldering method as claimed in claim 1, is characterized in that, the mechanical property of the deposited metal of the welding rod adopted: yield strength Rel >=490MPa; Tensile strength Rm 610 ~ 730MPa; Percentage elongation A >=20%;-50 DEG C of ballistic works: Akv >=54J.
3. welding rod arc soldering method as claimed in claim 1, it is characterized in that, chemical composition and the mass percent of described P690QL1 steel plate meet the following conditions: C≤0.20%, Si≤0.80%, Mn≤1.70%, P≤0.020%, S≤0.010%, N≤0.015%, B≤0.005%, Cr≤1.50%, Mo≤0.70%, Cu≤0.30%, Nb≤0.06%, Ni≤2.50%, Ti≤0.05%, V≤0.12%, Zr or Al, wherein select during Zr and make Zr≤0.15%, select during Al and make Al >=0.018%, surplus is Fe and inevitable impurity.
4. welding rod arc soldering method as claimed in claim 1, is characterized in that, the mechanical property of described P690QL1 steel plate meets: yield strength R el>=690MPa, tensile strength R m: 770 ~ 940MPa, percentage elongation A>=14%, clod wash b=3a, d=3a, 180 ° are qualified ,-20 DEG C of side knock merit Akv>=40J.
5. welding rod arc soldering method as claimed in claim 1, it is characterized in that, chemical composition and the mass percent of described Q370R steel plate meet the following conditions: C≤0.18%, Mn:1.20% ~ 1.60%, Si :≤0.55%, S≤0.010%, P≤0.020%, Nb:0.015% ~ 0.050%.
6. welding rod arc soldering method as claimed in claim 1, is characterized in that, described Q370R steel mechanical property meets: yield strength R el>=340MPa, tensile strength R m: 520 ~ 630MPa, percentage elongation A>=20%, clod wash b=2a, d=3a, 180 ° are qualified ,-20 DEG C of side knock merit Akv>=47J.
7. welding rod arc soldering method as claimed in claim 1, is characterized in that, described welding rod arc soldering method adopts multi-layer multi-pass welding, and interlayer temperature controls be no more than 250 DEG C.
CN201310313448.4A 2013-07-24 2013-07-24 For the welding rod arc soldering method that P690QL1 and Q370R steel welds mutually Expired - Fee Related CN103464877B (en)

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CN106041309A (en) * 2015-04-14 2016-10-26 中国十九冶集团有限公司南京分公司 A kind of welding method of Q420 high strength steel
CN107775156B (en) * 2017-09-13 2020-02-18 湖北三江航天万峰科技发展有限公司 Welding forming method and product of underwater pressure-bearing cast aluminum launching tube
CN112439976B (en) * 2020-11-13 2022-09-06 四川石油天然气建设工程有限责任公司 Detection method for carrying out visual measurement by utilizing welding-like heat input and welding method
CN114603234A (en) * 2022-04-02 2022-06-10 鲁西工业装备有限公司 Method for welding 42CrMo alloy steel and low-carbon steel dissimilar steel

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